issue #11: add base64.cpp and base64.h

cocos2dx/support/base64.cpp

@@ -0,0 +1,108 @@
+/****************************************************************************
+Copyright (c) 2010 cocos2d-x.org
+
+http://www.cocos2d-x.org
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+****************************************************************************/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "base64.h"
+
+unsigned char alphabet[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+INT32 _base64Decode( unsigned char *input, UINT32 input_len, unsigned char *output, UINT32 *output_len )
+{
+    static char inalphabet[256], decoder[256];
+    INT32 i, bits, c, char_count, errors = 0;
+	UINT32 input_idx = 0;
+	UINT32 output_idx = 0;
+
+    for (i = (sizeof alphabet) - 1; i >= 0 ; i--) {
+		inalphabet[alphabet[i]] = 1;
+		decoder[alphabet[i]] = i;
+    }
+
+    char_count = 0;
+    bits = 0;
+	for( input_idx=0; input_idx < input_len ; input_idx++ ) {
+		c = input[ input_idx ];
+		if (c == '=')
+			break;
+		if (c > 255 || ! inalphabet[c])
+			continue;
+		bits += decoder[c];
+		char_count++;
+		if (char_count == 4) {
+			output[ output_idx++ ] = (bits >> 16);
+			output[ output_idx++ ] = ((bits >> 8) & 0xff);
+			output[ output_idx++ ] = ( bits & 0xff);
+			bits = 0;
+			char_count = 0;
+		} else {
+			bits <<= 6;
+		}
+    }
+	
+	if( c == '=' ) {
+		switch (char_count) {
+			case 1:
+				fprintf(stderr, "base64Decode: encoding incomplete: at least 2 bits missing");
+				errors++;
+				break;
+			case 2:
+				output[ output_idx++ ] = ( bits >> 10 );
+				break;
+			case 3:
+				output[ output_idx++ ] = ( bits >> 16 );
+				output[ output_idx++ ] = (( bits >> 8 ) & 0xff);
+				break;
+			}
+	} else if ( input_idx < input_len ) {
+		if (char_count) {
+			fprintf(stderr, "base64 encoding incomplete: at least %d bits truncated",
+					((4 - char_count) * 6));
+			errors++;
+		}
+    }
+	
+	*output_len = output_idx;
+	return errors;
+}
+
+INT32 base64Decode(unsigned char *in, UINT32 inLength, unsigned char **out)
+{
+	UINT32 outLength = 0;
+	
+	//should be enough to store 6-bit buffers in 8-bit buffers
+	*out = (unsigned char *)malloc( (size_t)(inLength * 3.0f / 4.0f + 1));
+	if( *out ) {
+		INT32 ret = _base64Decode(in, inLength, *out, &outLength);
+		
+		if (ret > 0 )
+		{
+			printf("Base64Utils: error decoding");
+			free(*out);
+			*out = NULL;			
+			outLength = 0;
+		}
+	}
+    return outLength;
+}

cocos2dx/support/base64.h

@@ -0,0 +1,53 @@
+/****************************************************************************
+Copyright (c) 2010 cocos2d-x.org
+
+http://www.cocos2d-x.org
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+****************************************************************************/
+
+#ifndef __SUPPORT_BASE64_H__
+#define __SUPPORT_BASE64_H__
+
+#include "platform/platform.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif	
+	
+
+/** @file
+ base64 helper functions
+ */
+
+/** 
+ * Decodes a 64base encoded memory. The decoded memory is
+ * expected to be freed by the caller.
+ *
+ * @returns the length of the out buffer
+ *
+ @since v0.8.1
+ */
+INT32 base64Decode(unsigned char *in, unsigned int inLength, unsigned char **out);
+
+#ifdef __cplusplus
+}
+#endif	
+
+#endif // __SUPPORT_BASE64_H__